This is the CodeSystem that contains all the codes in SNOMED CT Việt Nam Subset — Vietnam SNOMED CT National Subset (http://fhir.hl7.org.vn/core/CodeSystem/vn-snomed-subset-cs) and SNOMED CT Việt Nam Subset — Vietnam SNOMED CT National Subset (http://fhir.hl7.org.vn/core/CodeSystem/vn-snomed-subset-cs). E.g. what you have to deal with if you get resources containing codes in either of them